Means for conveying aggregates in portable rock crusher machines



Nov. 14, 1939.

P. c MALMSTEN 2.179.747

E ROCK CRUSHER MACHINES MEANS FOR CONVEYING AGGREGATES IN PORTABL 1958 3 Sheets-Sheet 1 Filed Feb. 25

mm m P; C. MALMSTEN Nov. 14, 1939.

' MEANS FOR CONVEYING AGGREGATES IN PORTABLE'ROCK CRUSHER MACHINES Filed Feb. 25, 198 3 Shegts-Sheet 2 Inventor" Philip C. Malmsten. fi umwpfiww Patented Nov. 14, 1939 ITED STATES MEANS FOR CONVEYING AGGREGATES IN PORTABLE ROCK CRUSHER MACHINES Philip C. Malmsten, Minneapolis, Minn., assignor to Diamond Iron neapoiis, Minn.

Works, Incorporated, Min- Application February 25, 1938, Serial No. 192,531

1 Claim. (Cl. 198103) My invention relates to means for conveying aggregates in portable rock crusher machines, and relates to that type of rock crushers which are portable and may readily be transported from place to place where the pits are located containing suitable aggregates for road construction work. Such machines must be transported over highways with underpasses of limited height and it is important that they be limited in height and also as much as possible in length and that they be given a center of gravity as low as possible. The elements which determine the height and length of these machines are primarily the elevating conveyor which receives the aggregate from the pit at its lower end and carries it to the maximum point of height of the machine for delivery to a hopper from which it goes to the sifting and crushing means, the crushed aggregate being returned to the main elevating conveyor.

It is a principal object of my invention therefore to provide in association with an instrumentality of the rock crusher an arrangement of delivering and discharging hoppers for the main conveying belt in combination with means for transferring the crusher aggregate to the main belt 'of such a nature that the machine will be both shortened in length and reduced in height and that the crusher aggregate shall be deposited on the stream of pit aggregate onthe main conveyor belt rather than upon the naked belt, since the crusher aggregate is made up almost entirely of sharply angular bits of rock and if poured directly upon the naked belt would tend rapidly to destroy it.

It is a further object of my invention to provide a vertical transfer wheel rotatable about the main conveyor and located between the two hoppers for receiving material from the crusher rolls and delivering it upon the stream of pit aggregate going up the main conveyor from the receiving hopper from which the pit aggregate is delivered to the main conveyor. In carrying out this object the vertical transfer wheel is made relatively of small diameter bringing close together the end of the conveyor for crusher aggregate and the main conveyor belt which enables me to provide a compact machine having a low center of gravity, which is both shortened and made lower sothat the machine may readily be transported fromplace to place as the location of work and gravel pits may make desirable.

In the accompanying drawings which illustrate the application of my invention in two somewhat difierent forms:

. Fig. 1 is a side elevational view of the device.

Fig. 2 is a view in vertical section on the line 2-2 of Fig. 3.

Fig. 3 is a view in vertical section on the line 33 of Fig. 2.

Fig. 4 is a view in vertical section on the line 4-4 of Fig. 2.

Referring to the construction shown in ,the drawings, the numeral 6 designates side frame members of the machine which are mounted on wheels H) in order that the machine may be readily transported from place to place. The frame includes upwardly extending members l2, I4, l6 and I8 as best shown in Fig. 2, the members [2 and I8 being inclined forwardly. The members l6 and [8 support an open bottom hopper member 20 adapted to be supplied in any suitable manner with the material to be crushed. As shown this material may be supplied by an endless conveyor 22 running over a roller 24.

A flexible endless conveyor 26 having its forward portion below the hopper member 20 runs in upwardly inclined position over a lower roller 24 and an upper roller 30 as shown in Fig. l. The;

upper stretch of this conveyor runs over angularly disposed sets of rollers 32 carried by inclined frame members 34, the rollers being so positioned that the weight of material being carried will give the upper stretch of the conveyor a dished condition. The upper end of the conveyor 26 delivers into a hopper 35 supported by standards 31. Underneath the hopper 36 there is an inclined screen frame 38 carrying an upper screen 40 and a lower finer screen 42 as will be understood from Fig. l.

The screen frame 38 is supported at both sides by rods 44 which at their lower ends are pivoted to inclined frame members 46. Associated with the attachment of the rods 44 with the screen frame 38, are co led springs 48 which permit the screen frame to have a compound swinging movement up and down and back and forth. This movement is imparted by eccentrics 50 secured to a shaft .52 mounted in bearings carried by-standards 54 extending up from the main frame of the machine. The fine material or sand sometimes referred to as "fines", drops through both of the screens 40 and 42 into a hopper 56 underneath which is an endless conveyor 58 passing around a lower roller 60 and a similar upper roller not shown. The conveyor 58 carries the fine material to the desired point of delivery, it being noted that th upper stretch of the conveyor is supported by small rollers 62 so arranged that the weight of material causes the upper stretch to assume a dished condition in manner similar to that previously referred to.

The material which is too coarse to drop through the upper screen 40 passes off the lower end thereof to a chute 64 which carries it to a jaw crusher 66 of well known construction which delivers upon an endless conveyor 68 passing around a lower roller I0 and around an upper roller I2 adjustable by a threaded device I3 as shown in Fig. 2. The upper stretch of this conveyor is supported by small rollers I4. The material which drops through the upper screen 40 but which is too coarse to drop through the lower screen 42 passes off the lower end of the latter into an open bottom box I6 from which it passes between the rolls I8 and 80 of a roll crusher which delivers upon the conveyor 68 previously referred to.

An important feature of the machine will now be described in detail. This includes a vertical lifting wheel I0 located as shown, Figs. 1 and 2, between receiving hopper 20 and delivery hopper 36 but low on themachine andnear hopper 20 which is supported at its two peripheries by flanged rollers I2. As will be understood from Fig. 4, the wheel I0 has annular side members I4 whereby an open center for the wheel is provided. The two opposite side members I4 are connected by a series of partitions I6 which form pockets extending peripherally around the wheel. The partitions I6 instead of being radially disposed, are inclined in outward direction reversely to the direction of rotation of the wheel. In order to rotate the wheel, it is provided on its periphery with an external ring gear I8 meshing with a pinion 80 secured to a shaft 82. Also secured to the shaft 82 is a bevel gear 84 meshing with a bevel gear 86 secured to a shaft 80 to which is secured a wheel 90. A flexible element 92 passes around the wheel 90 and around a wheel 94 secured to a driven shaft 96. Secured to the shaft 88 is a second wheel 89 which is connected by a flexible element 9i with a wheel 93 secured to the shaft of the roller I2 whereby the conveyor 681s driven.

As is apparent from Fig. 2, the upper end of the conveyor 68 previously referred to, delivers the material through the open center of the wheel I0 into the lower portion thereof. :-The conveyor 26 extends through the open center of the wheel I0 above the delivery end of the conveyor 68. Fixed side wall members 98 for the conveyor 26 also pass through said open center being supported by brackets I00 which extend up from the frame members 34. The lower ends of the side wall members 98 are connected by an inclined wall member I02 which in -effect constitutes part of the hopper member 20 through which the pit material in uncrushed condition is delivered to the endless conveyor 26. The material from the crushers is delivered by the conveyor,68 into the lower portion of the lifting wheel I0 being guided into the pockets formed by the partitions I6 due to inclined deflectors I04 adjacent the delivery end of the conveyor 66. When the material which is being carried up by the wheel reaches its uppermost position, it slides out by gravity upon the endless conveyor 26 being deflected thereon by the inclined wall members 98. As above indicated the pit material is already on the conveyor 26 so the crusher material flowsupon the pit material on the conveyor and does not contact the body of the conveyor at all. This is of material importance, since the crusher material is of broken rock with sharp and jagged edges-which if contacting the material of the conveyor directly will rapidly disintegrate and destroy it.

The manner in which the various parts of the machine are driven will now be described. A driving pulley I06 which may be driven from any suitable source of power is secured to the power shaft I08 which operates the jaw crusher 66 in well known manner. Secured to the shaft I08 as shown in Fig. 1 is a Wheel IIO connected by a crossed flexible element I I2 with a wheel II4 secured to the shaft 96 previously referred to for driving the latter. Secured to the shaft I08 is a wheel H6 connected by a belt H8 with a wheel I20 secured to a shaft I22 which has a smaller wheel I24 secured thereto. A belt I26 passes around the wheel I24, around a wheel I28 secured to a shaft I30, and around wheels secured to the shafts of the roll crushers I8 and 80 in such manner that these rolls are driven in the proper direction. A belt I32 passes around a wheel secured to the shaft I30 and around a wheel I34 secured to a shaft I36. A second wheel secured to the shaft I36 is connected by a belt I38 with a wheel on the upper roller of the conveyor 26 by means of which this conveyor is driven. A third wheel secured to the shaft I36 is connected by a belt I40 with a wheel on the upper roller of the conveyor 58 by means of which this conveyor is driven. In order to drive the eccentrics which operate the screen frame 38, a belt I42 passes around a wheel I44 secured to the shaft I08 and around a wheel I46 secured to the shaft of the eccentrics.

The operation and advantages of my invention will be apparent in connection with the foregoing description and the accompanying drawings. The compact assembly of the machine whereby the structure is kept low down is apparent from Fig. 1. The lower end of the endless conveyor 26 is positioned quite low with the delivery means for pit aggregate above this lower end. The endless conveyor needs to be inclined upwardly only sufliciently to provide for the screening and take away devices. This enables the crushing mechanism to be placed low down and the conveyor 68 from the crushing mechanism is positioned to makea sharp angle with the main conveyor 26 so that the lifting wheel I2 is of relatively small diameter making the whole arrangementexceedingly compact, low in itscenter of gravity and shortening and lowering the entire mechanism.

In the operation of the machine, all fine material such assand and portions not needing to be crushed, falls directly through the sifting device 1 and is immediately taken away. Portions of the material fine enough to pass through the upper screen but not fine enough to pass through the lower screen are separated out and delivered to the crushing rolls. Portions of the material not fine enough to pass through the upper screen are delivered to the crushing jaws. All of the material which is fine enough not to require crushing is separated out and taken awaywithout going through either of the crushers. Portions of the material fine enough to require crushing only by the roll crusher do not pass through the jaw crusher. Material coming from the jaw crusher and rendered suficiently fine for treatment by the roll crusher goes directly to the roll crusher and is not repassed through the jaw crusher. All of the crusher material is transferred over a very short path on the lift or transfer wheel and thence on the pit aggregate moving upward in a layer over the main conveyor belt from which it is delivered with the pit aggregate to the sifting mechanism as above described.

I claim:

In a portable rock crusher, having a receiving hopper at its rear and toward its lower portion, a second hopper at its front and upper portion and an endless conveyor taking material from the first hopper to the second hopper, a vertical transfer wheel located between said hoppers and adjacent the rear hopper and encircling said endless conveyor, and means for delivering crusher aggregate thereto, said vertical transfer wheel operating to deposit such material on the endless conveyor after said conveyor has received material from the first named hopper.

PHILIP C. MALMSTEN. 

